CN111060604B - Acoustic emission sensor fixing device and use method thereof - Google Patents
Acoustic emission sensor fixing device and use method thereof Download PDFInfo
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- CN111060604B CN111060604B CN202010009372.6A CN202010009372A CN111060604B CN 111060604 B CN111060604 B CN 111060604B CN 202010009372 A CN202010009372 A CN 202010009372A CN 111060604 B CN111060604 B CN 111060604B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 210000004907 gland Anatomy 0.000 claims abstract description 47
- 239000004567 concrete Substances 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000006261 foam material Substances 0.000 claims description 4
- 235000014121 butter Nutrition 0.000 claims description 2
- 239000004519 grease Substances 0.000 claims description 2
- 239000004264 Petrolatum Substances 0.000 claims 1
- 229940066842 petrolatum Drugs 0.000 claims 1
- 235000019271 petrolatum Nutrition 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 28
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229940099259 vaseline Drugs 0.000 description 2
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses an acoustic emission sensor fixing device and a use method thereof, wherein the device comprises a base frame, a gland and an adjusting bolt, wherein the adjusting bolt is connected with the gland, the base frame is provided with a mounting hole, the gland is in a hollow round table shape, the adjusting bolt applies force to the gland, the acoustic emission sensor is tightly attached to the surface of a concrete structure, and the gland can limit the circumferential position of the acoustic emission sensor; the using method of the device comprises the following steps: (S1) bonding the base frame to the surface of the concrete structure; (S2) pushing the gland into the base frame; (S3) placing an acoustic emission sensor in the mounting hole and pressing the gland against the acoustic emission sensor; (S4) applying a force to the gland with the adjusting bolt; and (S5) recycling the device and the sensor according to a process reverse to the installation sequence after the signal acquisition is finished. The device can provide stable circumferential clamping force for the acoustic emission sensor, and is suitable for various load tests and actual engineering measurement scenes; avoiding the generation of the hoop effect and affecting the test effect.
Description
Technical Field
The present invention relates to a fixing device and a method of using the same, and more particularly, to an acoustic emission sensor fixing device and a method of using the same.
Background
Acoustic emission technology, which is a real-time dynamic monitoring technology, has been increasingly applied to experimental research and actual engineering of civil structures. The reliability of the attachment of the sensor and the monitored object is critical to the acquisition of acoustic emission data, and the effectiveness of monitoring is directly determined. The fixing of acoustic emission sensors to the surface of such quasi-brittle artificial stone materials in concrete has considerable difficulty. The traditional method adopts two fixing modes of tape winding or rubber band binding, but the former is easy to form integral constraint on the acoustic emission sensor and the test piece, so as to generate a hoop effect and influence the test result; the latter is very easy to cause the acoustic emission sensor to roll in the test process, and the reliability of the contact between the sensor and a test piece is difficult to ensure. The existing acoustic emission sensor fixing device takes a single Newton third law as a basic starting point in the aspect of stress characteristics, and the sensor is attached to the surface of a test piece in a mode of applying pressure to the axial direction of the sensor by utilizing a spring, but the sensor cannot overcome loads caused by lateral force and acceleration, so that the application range of the sensor fixing device is limited to static loading, and the sensor fixing device is not applicable to the condition of dynamic loading; in the structural form, the acoustic emission sensor of the small-sized cube and cylinder test piece in the laboratory can be only met, the acoustic emission sensor is not suitable for larger-sized test pieces or different-sized structures, and the requirements of engineering practical application can not be met. For hydraulic concrete structures, the structural forms are various, even the structures are often special-shaped structures, the body types are usually large, and power loading tests are often required to be carried out, so that the existing acoustic emission sensor fixing device cannot meet the requirements in the structural forms and the stress characteristics.
Disclosure of Invention
The invention aims to: the invention aims to provide an acoustic emission sensor fixing device which has structural stress stability and can be suitable for a dynamic loading test, and another aim of the invention is to provide a using method of the device.
The technical scheme is as follows: the invention relates to an acoustic emission sensor fixing device which comprises a base frame, a gland and an adjusting bolt, wherein the adjusting bolt penetrates through the top of the base frame and is connected with the gland, the base frame is provided with a mounting hole for limiting the mounting position of an acoustic emission sensor, the gland is in a hollow round table shape, the adjusting bolt applies force to the gland, the acoustic emission sensor is tightly attached to the surface of a concrete structure, and the gland can limit the circumferential position of the acoustic emission sensor.
The base frame comprises a base, a vertical plate arranged on the base and a top plate covered on the vertical plate, wherein the base is provided with a mounting hole for fixing the acoustic emission sensor, the vertical plate comprises a right vertical plate, a rear vertical plate and a left vertical plate, an inverted L-shaped chute is arranged between the right vertical plate and the left vertical plate, an I-shaped chute is arranged between the rear vertical plate, and a nut hole is arranged on the top plate; the pressing cover is provided with a limiting hole matched with the adjusting bolt, a right sliding key and a left sliding key matched with the L-shaped chute and a rear sliding key matched with the I-shaped chute are arranged on the outer periphery of the bottom, and an EVA foam material is attached to the inner wall of the cavity of the pressing cover round table; the adjusting bolt comprises a spanner means, a threaded section and a smooth section, wherein the spanner section is used for manually turning the bolt, the threaded section is matched with the nut hole and used for adjusting the lifting of the adjusting bolt, and the smooth section is matched with the limiting hole and ensures that excessive moment is not applied to the gland in the process of rotating the adjusting bolt.
The application method of the acoustic emission sensor fixing device comprises the following steps:
(S1) marking an installation mark on a surface of a concrete structure, placing a base frame on the concrete structure such that the installation mark is positioned right in the middle of the base frame, and extruding an adhesive at a contact surface of the base frame and the concrete structure to adhere the base frame to the surface of the concrete structure;
(S2) pushing the gland into the base frame;
(S3) placing the acoustic emission sensor in the fixed base frame, placing the acoustic emission sensor in the mounting hole, and pressing the gland onto the acoustic emission sensor;
(S4) rotating the adjusting bolt through the top of the base frame to connect with the gland and applying a downward force to the gland;
and (S5) dismantling the fixing device according to a process reverse to the installation sequence after the acquisition of the acoustic emission sensor signals is completed.
In step S3, an acoustic emission sensor couplant is coated in the mounting hole, and the acoustic emission sensor couplant is vacuum grease, vaseline or butter.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that: 1. the device can provide stable and circumferential and reliable clamping force for the acoustic emission sensor, and is suitable for various load tests and actual engineering measurement scenes; 2. binding of the object to be tested is avoided, and the effect of the test is prevented from being influenced by the hoop effect; 3. the assembled installation makes the device simple in structure and convenient to use.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a base structure;
FIG. 3 is a cross-sectional view of a base frame;
FIG. 4 is a B-B cross-sectional view of the base frame;
FIG. 5 is a C-C cross-sectional view of the base frame;
FIG. 6 is a top plan view of the gland;
FIG. 7 is a D-D rotary cross-sectional view of the gland;
FIG. 8 is a schematic view of an adjusting bolt construction;
FIG. 9 is a graph of acoustic emission signal amplitude versus time acquired using a stationary sensor of the present invention;
FIG. 10 is a graph of the amplitude of acoustic emission signals acquired by the sensors over time in the comparative example;
FIG. 11 is a waveform of raw signals acquired by a stationary sensor of the present invention;
fig. 12 is a waveform chart of a raw signal acquired by the sensor in the comparative example.
Detailed Description
Examples
As shown in fig. 1 to 5, the acoustic emission sensor fixing device comprises a base frame 1, a gland 2 and an adjusting bolt 3, wherein the adjusting bolt 3 penetrates through the top of the base frame 1 to be connected with the gland 2, the base frame 1 is provided with a mounting hole 111 for limiting the mounting position of the acoustic emission sensor 4, the gland 2 is in a hollow round table shape, the adjusting bolt 3 applies force to the gland 2 to enable the acoustic emission sensor 4 to be tightly attached to the surface of a test piece, the gland 2 can limit the circumferential position of the acoustic emission sensor 4, the base frame 1 comprises a base 11, a vertical plate 12 mounted on the base 11 and a top plate 13 covered on the vertical plate 12, the base 11 is provided with a mounting hole 111 for fixing the acoustic emission sensor 4, the vertical plate 12 comprises a right vertical plate 121, a rear vertical plate 122 and a left vertical plate 123, an inverted-L-shaped chute is arranged in the middle of the right vertical plate 121 and the left vertical plate 123, an I-shaped chute is arranged in the middle of the rear vertical plate 12, and a nut hole 131 is arranged on the top plate 13. As shown in fig. 6 and 7, the gland 2 is provided with a limiting hole 21 matched with the adjusting bolt 3, the outer edge of the bottom is provided with a right sliding key 221 and a left sliding key 223 matched with the L-shaped chute and a rear sliding key 222 matched with the I-shaped chute, and the inner wall of the round platform cavity of the gland 2 is attached with the EVA foam material 20. As shown in fig. 8, the adjusting bolt 3 includes a spanner 31, a threaded section 32 and a smooth section 33, the spanner 31 is used for manually turning the bolt, the threaded section 32 is adapted to the nut hole 131 for adjusting the lifting of the adjusting bolt 3, the smooth section 33 is adapted to the limiting hole 21, and it can be ensured that an excessive moment is not applied to the gland 2 in the process of turning the adjusting bolt 3.
During installation, the method comprises the following steps:
(1) Determining the layout position of the acoustic emission sensor: determining the accurate position of an acoustic emission sensor to be arranged on the surface of a cuboid concrete test piece with the structural member of 200mm multiplied by 400mm, checking the surface evenness of the test piece at the position, and polishing and flattening the uneven part to ensure that the acoustic emission sensor 4 can be in stable and effective contact with the surface of the concrete test piece, and marking the arranging position by using a pencil or a marker pen after polishing and flattening; the concrete test piece mix adopts a concrete mix recommended by a certain dam, as shown in table 1:
TABLE 1 mixing proportion of hydraulic concrete
The cement is P. C32.5R composite Portland cement, the river sand is medium sand with fineness modulus F.M =2.81, and the coarse aggregate is continuous graded broken stone with particle size of 5-25 mm; the acoustic emission sensor 4 is SAMOSTM acoustic emission collector developed by American physical acoustic company, the sensor is R6a type resonant low-frequency acoustic emission sensor, and the peak frequency is 30kHz;
(2) Mounting base frame 1: firstly, roughly adjusting the position of the base frame 1 to enable the mounting mark to be positioned at the center of the mounting hole 111, further vertically observing from top to bottom by means of the base nut hole 131, finely adjusting the position of the base frame until the mounting mark is positioned right below the base nut hole 131 according to the three-point first-line principle, thereby ensuring that the mounting mark is positioned at the centroid of the sensing surface of the acoustic emission sensor 4 after the mounting is finished, manually applying pressure to enable the base frame 1 not to displace, dripping proper adhesive on the contact surface of the base 11 and a concrete test piece, and removing the manually applied mounting pressure after the adhesive reaches the working strength, thereby finishing the mounting of the base frame 1;
(3) Uniformly coating a layer of acoustic emission sensor couplant in the mounting hole 111, wherein the couplant is vaseline;
(4) The sliding keys 221 and 223 of the pressing cover 2 are respectively aligned with the horizontal groove openings of the inverted L-shaped sliding grooves in the middle of the right vertical plate 121 and the left vertical plate 123, the pressing cover 2 is horizontally pushed into the bottom of the horizontal groove, at the moment, the sliding keys 222 just enter the I-shaped groove in the middle of the rear vertical plate 12, and then the pressing cover 2 is vertically pushed downwards, so that the three sliding keys of the pressing cover respectively slide in the respective vertical sliding grooves, and the pressing cover installation is completed;
(5) Adjusting the vertical position of the gland 2, leaving an installation space for the emission sensor 4, placing the emission sensor 4 into the fixed base frame 1 from the side of the base frame 1 without the vertical plate, placing the sensing end of the emission sensor 4 into the installation hole 111, then pressing down the gland 2 to enable the EVA foam material 20 on the inner wall of the gland to be attached to the emission sensor 4, and manually applying pressure with proper magnitude on the gland 2 to enable the emission sensor 4 to be stable;
(6) Rotating the adjusting bolt 3 through the nut hole 131, enabling the threaded section 32 to be matched with the nut hole 131, finely adjusting the position of the gland 2 to enable the adjusting bolt 3 to be inserted into the limit hole 21, screwing the adjusting bolt 3 by utilizing the spanner means 31, enabling the end part of the smooth section 33 to tightly press the bottom of the limit hole 21, tightly pressing the cover 2, and finally reliably fixing the acoustic emission sensor 4 on the surface of a test piece, wherein in the fixing mode, the acoustic emission sensor 4 can be kept in stable and firm contact with the test piece even under the action of large acceleration or impact load;
(7) According to a lead breaking method suggested by ASTM specification, breaking lead on the central axis of an acoustic emission sensor 4 on a concrete test piece to simulate an acoustic emission source, breaking lead for 3 times, and collecting acoustic emission signals;
(8) The acoustic emission sensor 4 is removed and the acoustic emission sensor fixing device is recovered: firstly, screwing up the adjusting bolt 3, releasing the fixed pressure applied to the acoustic emission sensor 4, protecting the sensor from falling by one hand, continuously screwing up the adjusting bolt 3 by the other hand until the adjusting bolt 3 is dismounted from the base frame 1, then lifting the gland 2, taking away the acoustic emission sensor 4, finally recovering the gland 2 according to the process opposite to the mounting process, namely, firstly lifting the gland 2 to the top end of the vertical chute of the inverted L-shaped groove, and recovering the acoustic emission sensor 4 by the acoustic emission sensor fixing device.
According to the acoustic emission sensor fixing device provided by the invention, on one hand, the acoustic emission sensor is subjected to the action of 'pressing' in the axial direction through the pressing cover 2 to limit the axial displacement of the acoustic emission sensor, and on the other hand, the upper end and the lower end of the acoustic emission sensor 4 are respectively fixed in the lateral direction through the mounting hole 111 and the inner wall of the pressing cover 2 to limit the lateral displacement of the acoustic emission sensor, so that the sensor cannot translate or roll even if the sensor is subjected to the action of acceleration in the working process, and the stability of the sensor fixing is ensured.
Comparative example
Determining the accurate position of an acoustic emission sensor to be arranged on the surface of a cuboid concrete test piece with the structural member of 200mm multiplied by 400mm, checking the surface evenness of the test piece at the position, and polishing and flattening the uneven part to ensure that the acoustic emission sensor can be in stable and effective contact with the surface of the concrete test piece, and marking the arranging position by using a pencil or a marker after polishing and flattening; the concrete test piece mix adopts a concrete mix recommended by a certain dam, as shown in table 2:
TABLE 2 mixing proportion of hydraulic concrete
The cement is P. C32.5R composite Portland cement, the river sand is medium sand with fineness modulus F.M =2.81, and the coarse aggregate is continuous graded broken stone with particle size of 5-25 mm; the acoustic emission sensor is SAMOSTM acoustic emission collector developed by American physical acoustic company, the sensor is R6a type resonant low-frequency acoustic emission sensor, and the peak frequency is 30kHz;
and binding and arranging the acoustic emission sensor on the top surface of the concrete test piece by adopting a traditional adhesive tape, simulating an acoustic emission source by breaking lead on the central axis of the acoustic emission sensor 4 on the concrete test piece according to a lead breaking method suggested by ASTM specification, breaking the lead for 3 times, and collecting acoustic emission signals.
As shown in fig. 9 to 12, it can be seen from fig. 9 and 10 that, in the vibration state, since the adhesive tape cannot give a stable holding force to the sensor, even if the sensor cannot be loosened by naked eyes, the sensor still generates a tiny relative displacement with the concrete member, so that a lot of noise is collected, while the sensor fixing device provided by the invention is relatively stable in fixation and the collected noise is obviously less; as shown in fig. 11 and 12, in the vibration state, the sound waves collected in the comparative example interfere strongly, so that the collected sound emission signals are severely distorted, and in the embodiment, the collected waveforms are relatively good due to the stability of fixation.
Claims (4)
1. The acoustic emission sensor fixing device is characterized by comprising a base frame (1), a gland (2) and an adjusting bolt (3), wherein the adjusting bolt (3) penetrates through the top of the base frame (1) to be connected with the gland (2), the base frame (1) is provided with a mounting hole (111) for limiting the mounting position of an acoustic emission sensor (4), the gland (2) is in a hollow round table shape, the adjusting bolt (3) applies force to the gland (2) to enable the acoustic emission sensor (4) to be clung to the surface of a concrete structure, and the gland (2) can limit the circumferential position of the acoustic emission sensor (4);
The base frame (1) comprises a base (11), a vertical plate (12) arranged on the base (11) and a top plate (13) covered on the vertical plate (12), wherein a mounting hole (111) is formed in the base (11) and used for fixing the acoustic emission sensor (4), the vertical plate (12) comprises a right vertical plate (121), a rear vertical plate (122) and a left vertical plate (123), an inverted L-shaped chute is formed in the middle of the right vertical plate (121) and the left vertical plate (123), an I-shaped groove is formed in the middle of the rear vertical plate (122), and a nut hole (131) is formed in the top plate (13);
The gland (2) is provided with a limiting hole (21) matched with the adjusting bolt (3), and the outer edge of the bottom is provided with a right sliding key (221) and a left sliding key (223) matched with the L-shaped chute and a rear sliding key (222) matched with the I-shaped chute along the circumference;
EVA foam material (20) is attached to the inner wall of the round platform cavity of the gland (2);
The adjusting bolt (3) comprises a spanner means (31), a threaded section (32) and a smooth section (33), wherein the spanner section (31) is used for manually turning the bolt, the threaded section (32) is matched with a nut hole (131) and used for adjusting the lifting of the adjusting bolt (3), and the smooth section (33) is matched with a limit hole (21);
In use, an adhesive is extruded between the base (1) and the concrete structure at the contact surface, so that the base (1) is bonded to the concrete structure surface.
2. A method of using the acoustic emission sensor fixture of claim 1, comprising the steps of:
(S1) marking an installation mark on the surface of a concrete structure, placing a base frame (1) on the concrete structure, enabling the installation mark to be positioned in the middle of the base frame (1), and extruding an adhesive at the contact surface of the base frame (1) and the concrete structure to enable the base frame (1) to be adhered on the surface of the concrete structure;
(S2) pushing the gland (2) into the base frame (1);
(S3) placing the acoustic emission sensor (4) into the fixed base frame (1), placing the acoustic emission sensor into the mounting hole (111), and pressing the gland (2) on the acoustic emission sensor (4);
(S4) rotating the adjusting bolt (3) to penetrate through the top of the base frame (1) to be connected with the gland (2) and applying downward force to the gland (2);
And S5, dismantling the fixing device according to a process with reverse installation sequence after the signal acquisition of the acoustic emission sensor (4) is finished.
3. The method of using an acoustic emission sensor fixture as claimed in claim 2, wherein in step S3, an acoustic emission sensor couplant is applied in the mounting hole (111).
4. A method of using an acoustic emission sensor fixture as defined in claim 3, wherein the acoustic emission sensor couplant is vacuum grease, petrolatum or butter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010009372.6A CN111060604B (en) | 2020-01-06 | 2020-01-06 | Acoustic emission sensor fixing device and use method thereof |
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| CN202010009372.6A CN111060604B (en) | 2020-01-06 | 2020-01-06 | Acoustic emission sensor fixing device and use method thereof |
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| CN111060604B true CN111060604B (en) | 2024-06-18 |
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| CN112578026B (en) * | 2020-12-10 | 2023-10-20 | 重庆电子工程职业学院 | Fixing device of acoustic emission sensor |
| CN112762290B (en) * | 2020-12-31 | 2022-07-01 | 哈尔滨工业大学 | L-shaped acoustic emission sensor array clamp and test method for detecting gas leakage |
| CN117515382A (en) * | 2023-12-29 | 2024-02-06 | 中北大学 | Acoustic emission sensor clamp for laser cladding on-line monitoring |
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| CN211741166U (en) * | 2020-01-06 | 2020-10-23 | 河海大学 | Acoustic emission sensor fixing device |
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| CN201149587Y (en) * | 2008-01-22 | 2008-11-12 | 长沙理工大学 | Fixed bearing with continuously adjustable clamping force for acoustic emission sensor |
| CN102661999A (en) * | 2012-05-02 | 2012-09-12 | 河海大学 | Acoustic emission sensor fixing device for concrete surface |
| CN104764809B (en) * | 2015-02-09 | 2017-08-25 | 四川大学 | The adjustable acoustic emission test sensor positioner tested for damage of rock |
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